Carburetor



Aug 13, 19%. D. ,J. ENRIGHT CARBURE'I'OR 2 Sheets-Sheet 1.

Filed Jan. 5, 1944 Attorneys Patented Aug. 13, 1946 UNITED. STATES.PATENT oF-FicE Daniel J. Enright, Rochester, N. Y. Application January5, 1944, Serial No. 5173081 The present invention relate to new anduseful improvements in carburetors and has for its primary object toprovide unitary control means for the needle valve of the float chamberand the butterfly throttle valve and butterfly air intake valve toinsure a proper and uniform mixture of air and fuel fed to the intakemanifold of the engine.

A further important object of the invention is to eliminate thenecessity of the usual Venturi in a carburetor and to provide amechanism for furnishing a proper mixture of fuel and air through anunrestricted air tube of uniform diameter.

Another object is to provide novel means for actuating the needle valveof the carburetor and for adjusting the needle valve independently ofthe butterfly valve.

A still further object is to provide a carburetor of simple andpractical construction which is efiicient and reliable in performance,relatively inexpensive to manufacture and otherwise well adapted for thepurposes for which the same is intended.

Other objects and advantages reside in the details of construction andoperation as morevfully hereinafter described and claimed, referencebeing had to the accompanying drawings forming part hereof, wherein likenumerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view.

Figure 2 is a top plan view.

Figure 3 is a longitudinal sectional view through the air tube.

Figure 4 is a vertical sectional view through the needle valve and floatchamber.

Figure 5 is a detail in section of the sliding cam for actuating theneedle valve.

Figure 6 is a sectional view taken on a line 6-6 of Figure 5.

Figure 7 is a detail of the adjustable pulley, with parts in section.

Referring now to the drawings in detail, the numeral 5 designates an airtube which is open at one end for admitting fresh air and is provided atits other end with an attaching flange 4 for attaching to a manifold 6of an internal combustion engine.

Near the open end of the tube is a transverse shaft 1 to which issecured a butterfly choke valve 8, one end of the shaft having a lever 9attached thereto by a split end H]. To the other end of the lever isattached a choke wire ll adapted for manual actuation in the usualmanner.

Near the other end of the tube 5- is a trans- 1 Claim. (01. 261-49)verse shaft [2 to which is secured a butterfly valve l3. the shafts land I2 bEillgDOSitiOllGd at right angles to each other and to one end ofthe shaft I2 is also secured a throttle lever [4 by a split end l5. Tothe other end of the lever i4 is attached a throttle control rod [6.

A pulley wheel I! is fixed to the shaft 12 for rotation therewith and onthe pulley is trained a chain or other flexible member [8, the chainalso being trained over an idler pulley l9 journaled on a pin 20 at oneend of an elongated plate IS, the plate being supported adjacent itsother end on a vertical rod 2| which is slidably and rotatably mountedin a bracket 2|" and secured in adjusted position by a set screw 2|".The bracket 2| is secured tothe side of the tube 5. One end of the chain18 is attached to one nd of a pair of elongated superposed cam plates 22and 23, while the other end of the chain is attached to the other end ofthe lowermost plate 23. To the remaining end of the upper plate 22 issecured a tube 24 which is internally threaded at its upper portion andhas a cup 25 on its upper end. An adjusting screw 26 is threaded in thetube 24 with its lower end journaled in the plate 23 and upset to securethe screw to said lastnamed plate. The pulley I9 is eccentric withrespect to the axis of the pin 2| in order that the pulley l9 may beadjusted laterally and vertically to properly align the pulleys inaccordance with the adjustments made in the cam plates and thus reducefriction of the chain on the pulleys.

The upper end of the screw is formed with a cylindrical head 21 freelyrotatable in the cup 25 and the inner walls of the cup are verticallycorrugated as indicated at 28 in the valleys of which is seated a springprojected ball 29 recessed in the side of the head 21 to prevent idlerotation of tho head and to secure the screw 26 in its adjusted positionin the tube 24.

Accordingly, one end of the upper cam plate 22 may be raised or loweredby the manipulating of the screw 26.

The plates 22 and 23 are formed with registering longitudinal slots 30and 3|, respectively, through which is freely received the upper end ofa needle valve 32 which extends vertically through a port 32' in thebottom of the tube 5 and into the float chamber 33 of conventionalconstruction for engaging the valve seat 34 therein.

A cup 35 is formed with a hollow internally and externally threaded stem36 which is threaded into the top of the tube 5 and within the cup is ahollow cylindrical adjusting plug 31 having an is mounted on the lowerportion of the needle valve between the stem 38 and a collar 411threaded on the lower end of tho valve, the adjustment of the plug 31 inthe cup 35 regulating the tension of the spring 39.

The cup 35 is also internally vertically corru;

gated and the plug'3'l fis'provided with a. spring projected ballsimilar to the cup 35 and head 21 to secure the plug 31 in adjustedposition The upper portion of the needle valve 32 is threaded forengagement by a cup 40 having i s lower end overlying and bridging theslots 30 and 31 for sliding engagement by the upper cam plate 22 wherebyto raise the needle valve upon movement of the plates in one direction,the

spring 39 closing the valve. r

A cylindrical plug M is threaded on the needl valve 32 into the cup 40and is also provided with a spring projected ball for engaging theinternal vertical corrugations of the cup 40 similar to the cup 25 andhead 27 to, secure the cup 40 in adjusted position. A locking cap 42 isthreaded on the upper end of the needle valve.

Between the needle valve 32 and the choke valve 8 is a butterfly valve43 secured on a shaft 44 journaled in the tube parallel to the shaft 1and forming an air control valve. To the outer endvof the shaft 44 issecured the split end 45 of a lever 46 and to the other end thereof ispivotally attached a turnbuckle 4'! connecting the lever 46 to thepulley wheel I! by means of an eccentrically disposed pivot pin 48.

Accordingly as the throttle lever I4 is actuated by the throttle rod 16,the air valv 43, needle valve 32 and throttle valve [3 will besimultane- 4 ously opened and closed to uniformly supply a predeterminedmixture of fuel and air to the intake manifold of the engine.

It is believed that the details of construction and manner of use of thedevice will be readily understood from the foregoing without furtherdetailed explanation. l

Having described the invention, what is claimed as wl s= v j .A'carburetor comprising anair intake tube adapted forattaching to theintake manifold of an engine, a float chamber carried by the tube andhaving communication therewith, a needle valve slidably mountedtransversely of the tube and controlling the feeding of fuel from thefloat chamber into the tube, a throttle valve in the tube inwardly ofthe needle valve, an air control valve in the tube outwardly of theneedle valve,'a link connecting the throttle and air valves forsimultaneous opening and closing movement, a pulley secured to the shaftof the throttle valve, an idle pulley journaled on the tube, an endlessflexible member trained on said pulleys and including an elongated camtherein having a longitudinal slot receiving the needle valve,vertically spaced members adjustably carried by the needle valve andpositioned respectively above and below the cam and in engagementtherewith, one of said members being operable to vertically adjust theneedle valve, and said cam being operable to open the needle valve,spring means for closing the needle valve, and means for adjusting theidle pulley in accordance with the adjustment of said members to centerthe flexible member between the flanges of the idle pulley and to takeup slack in the flexible member.

DANIEL J. ENRIGHT.

